The Radical Image Optimization Tool (RIOT for short) was developed to be a free image optimizer that will let you to visually adjust compression parameters while keeping minimum filesize.

It uses with a side by side (dual view) or single view interface to compare the original with the optimized image in real time and instantly see the resulting file size.

It is lightweight, fast and simple to use, yet powerful for advanced users. You will be able to control compression, number of colors, metadata settings and much more, and select image format (JPG, GIF or PNG) for your output file.

Input image types:

common bitmap images as well as Adobe Photoshop PSD files

popular HDR formats and RAW camera images

rare / scientific types (up to 128 bpp, integer and floating point)

Features:

open many image types including rare/scientific types

save and optimize JPEG, GIF and PNG with a simple, clean user interface

works in dual view: (original  optimized image) or single view (optimized image).

Automatic preview of resulting image

in-place compare function (alternativelly display the original image over the optimized image to notice small pixel changes)

Version History for RIOT:
* fixed batch mode broken for manual PNG output
* fixed opening of images with a single color like the one found in jquery-UI (ui-icons_2e83ff_256x240)
* fixed Compress to size action enabling
! using checkerboard to show transparency instead of background color from file. Some images have the background the same color as the foreground and that can be confusing.

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